Near field communication on a seamless metal band and metal backed device

A method and a mobile device that provides near field communication and wireless powering capabilities by coupling a one-piece metal back and a metal band to a device housing to form a device. The device is configured to provide at least one antenna keep-out area. The metal band is adapted to be a dual-band antenna that is coupled to a coil. The coil, operable as one of a near field communication coil and a wireless power transmission coil, forms an overlapping trace with the dual-band antenna along at least one physical area. The coil and the dual-band antenna are positioned in the antenna keepout area and around the perimeter of the device. The method further includes forming at least two turns in the coil. At least one diplexing component is coupled both to the coil and to the dual-band antenna.